How can I measure the noise on my AC mains with a 2ch oscilloscope?

"Live Music" is full of phase anomalies, microphone differences, crowd murmurs and smells, bow rosin dust, insane sound technicians, a lack of sound technicians, balding head reflections, unseasoned wood flooring, drapery...all of which you can try to measure or simply sit there and listen to it. What a mess... 

No need to worry neurotically about noise on the AC line. Competent engineering takes care of that.

I wish this was the case, and it is obviously helpful for many components, but as many people remark about hearing system differences depending on time of day or what else in the house is running concurrently, then it is not a blanket "fact"

Like Jason said.  Power doesn't matter.  Hook it up to a honda generator.  It'll be fine.  🤣

The emogee gives me hope that this was said in jest. Even the quality of the inverter when running a battery power system makes a world of difference. Unfortunately, there is no one solution that works for everyone, hence all the companies doing a brisk business these days.